Add squeeze morph to CLI

[Sparks29032]

Closes #192. Tests added based on existing test in test_morph_func.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.31%. Comparing base (ed2c088) to head (ba59467).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   97.23%   97.31%   +0.08%     
==========================================
  Files          20       20              
  Lines         903      931      +28     
==========================================
+ Hits          878      906      +28     
  Misses         25       25              

Files with missing lines	Coverage Δ
tests/test_morphio.py	100.00% <100.00%> (ø)

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[sbillinge]

lgtm